4m69
Crystal structure of the mouse RIP3-MLKL complex
Structural highlights
FunctionRIPK3_MOUSE Essential for programmed necrosis in response to death-inducing TNF-alpha family members. Upon induction of necrosis, RIPK3 interacts with, and phosphorylates RIPK1 to form a necrosis-inducing complex. RIPK3 binds to and enhances the activity of three metabolic enzymes: GLUL, GLUD1, and PYGL. These metabolic enzymes may eventually stimulate the tricarboxylic acid cycle and oxidative phosphorylation, which could result in enhanced ROS production (By similarity).[1] Publication Abstract from PubMedRIP3 is an essential upstream kinase in necroptosis. The pseudokinase MLKL functions as a substrate of RIP3 to mediate downstream signaling. The molecular mechanism by which RIP3 recognizes and phosphorylates MLKL remains unknown. Here, we report the crystal structures of the mouse RIP3 kinase domain, the MLKL kinase-like domain, and a binary complex between the two. Both RIP3 and MLKL adopt the canonical kinase fold. Free RIP3 exists in an active conformation, whereas MLKL-bound RIP3 is stabilized by AMP-PNP to adopt an inactive conformation. The formation of the RIP3-MLKL complex, involving their respective N- and C-lobes, is accompanied by pronounced conformational changes of the alphaC helix and activation loop in RIP3 and the corresponding structural elements in MLKL. RIP3-mediated MLKL phosphorylation, though important for downstream signaling, is dispensable for stable complex formation between RIP3 and MLKL. Our study serves as a framework for mechanistic understanding of RIP3-mediated necroptotic signaling. Structural Insights into RIP3-Mediated Necroptotic Signaling.,Xie T, Peng W, Yan C, Wu J, Gong X, Shi Y Cell Rep. 2013 Oct 17;5(1):70-8. doi: 10.1016/j.celrep.2013.08.044. Epub 2013 Oct, 3. PMID:24095729[2] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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